Motorcycle Oil Pan Drain: Number Of Threads And Their Importance

The oil pan drain bolt size is M12x1.5, with M being Metric. This means that the sump plug is Metric 12mm in diameter with a 1.5mm thread pitch.

Drain plug thread size

The thread size of a motorcycle oil pan drain plug is important to know when replacing the plug or repairing a stripped thread. The thread size is typically measured in metric dimensions, such as M12 x 1.25, where "M12" refers to the diameter of the threads. Thread pitch, which can be measured in threads per inch or the millimetres between each thread, is also an important specification to consider.

For example, the oil pan drain bolt of a Kawasaki Vulcan VN800 motorcycle is specified as M12 x 1.5, indicating a metric diameter of 12 mm and a thread pitch of 1.5 mm. This information can be used to source the correct replacement drain plug or repair kit for a stripped thread.

It is important to accurately measure the thread size and pitch when determining the correct oil drain plug for a motorcycle. This can be done using digital calipers or a ruler to measure the width of the plug at the widest part of the threads. Additionally, a thread pitch gauge can be used to measure the thread pitch in either threads per inch or millimetres.

There are various oil drain plugs available with different thread sizes to fit specific motorcycle models and manufacturers. It is crucial to use the correct thread size to ensure a secure fit and prevent leaks.

Drain pan recommendations

When it comes to recommendations for drain pans to use for motorcycle oil changes, there are a variety of options available. The most important factor to consider is ensuring that the drain pan is low profile enough to fit under the motorcycle. Here are some specific product recommendations for drain pans that are suitable for this purpose:

• Green-L Universal ABS Low Profile Oil Drain Pan with Spout: This drain pan is designed to fit Harley models 1984 and later, as well as other motorcycle brands such as Honda, Yamaha, Suzuki, and Kawasaki. It features a convenient carrying handle and a spout for easy emptying.
• Harley-Davidson Low Profile Oil Drain Pan: This drain pan is specifically designed for Harley-Davidson motorcycles and features a low-profile design that fits easily under standard height and lowered motorcycles. It has a 10-quart capacity and includes a raised hardware corral, a filter drain surface, and a pressure vent hole to prevent messy oil burping.
• Chapin 78005 Low Profile 12 Quart Oil Drain Container: This drain pan is made with recycled materials and fits most ATVs, tractors, lawn mowers, motorcycles, and low-clearance vehicles. It has a capacity of 12 quarts (11.4 liters) and is a popular choice, with over 3000 bought in the past month on Amazon.
• XMT-MTOT Universal Motorcycle Low Profile Oil Drain Pan: This drain pan is designed to fit various motorcycle models from Honda, Yamaha, Suzuki, and Kawasaki. It is made of ABS material and features a low-profile design.
• GarageBOSS 7 Quart Oil Drain Pan with Funnel: This drain pan is suitable for both home garage use and professional auto shop use. It includes a funnel and has a capacity of 7 quarts, making it convenient for multiple engine oil changes before needing to be emptied.

When selecting a drain pan for a motorcycle oil change, it is important to consider the height clearance, capacity, and ease of use. Some drain pans also offer additional features such as funnels, spouts, and carrying handles. It is also recommended to look for drain pans with a low-profile design to ensure they fit easily under the motorcycle.

Drain bolt issues

One of the most frustrating issues is a stripped or damaged oil pan drain hole. This can lead to oil leaks, which are not only messy but also harmful to the environment. To fix this issue, you may need to replace the drain bolt with an oversized self-threading bolt or use a thread insert (heli-coil) to repair the damaged threads. It is crucial to get the correct size, which is usually metric and specified as the diameter and thread pitch (e.g., M12x1.5).

Another issue is when the oil drain plug leaks only when the motorcycle is on the side stand. This peculiar problem can be due to a faulty seal or a damaged washer under the drain bolt. To fix this, you should re-thread the hole, replace the washer, and tighten the bolt. It is also important to ensure that the oil level is not too low, as this can affect the pressure in the oil pan.

Sometimes, the oil pan drain bolt may be cross-threaded, leading to incorrect torque and potential leaks. In such cases, it is essential to remove the bolt, inspect the threads, and re-thread the hole if necessary. This process may require a tap, which cuts new threads into the hole, ensuring a proper fit for the bolt.

If you are unsure about the size or type of drain bolt to use, it is always best to consult a professional mechanic or refer to the motorcycle's user manual. Attempting to fix drain bolt issues without the correct tools, knowledge, or parts can lead to further damage and costly repairs.

By following the instructions and tips provided in this section, you can effectively address common drain bolt issues on your motorcycle, ensuring a smooth and leak-free oil drainage system. Remember to take all necessary precautions when working with engine oil to protect yourself and the environment.

Thread repair

• 3/8-16
• 1/2-20 (for both aluminium and tin pans)
• 1/2-13
• 5/8-18
• 3/4-10
• 3/4-16
• M8x1.25
• M10x1.5
• M12x1.25
• M12x1.5 (both short and standard)
• M12x1.75
• M14x1.5 (for both aluminium and tin pans)
• M14x1.25
• M16x1.5
• M18x1.5
• M20x1.5
• M22x1.5
• M24x1.5

The thread repair kits contain the tools and inserts required to repair the threads. The tools are designed to be used by hand with a standard 3/8 ratchet.

Torque wrench usage

Torque wrenches are used to tighten nuts and bolts to a predetermined torque value, helping to avoid damage from over-tightening or joints coming apart from under-tightening. They have been used since the early 20th century and are a staple item in many toolkits. Torque is the measure of how much a force on an object causes it to rotate, with the pivot point being the axis the object rotates on.

There are several types of torque wrenches, including electronic, dial, adjustable/click, hydraulic, and micrometer. Here is a guide on how to use and maintain a torque wrench:

Adjustable/Click Torque Wrench Usage

• Choose the right type of torque wrench for the job. A 1/2-inch or 3/8-inch torque wrench will handle most jobs, while a 1/4-inch torque wrench is ideal for more precise tasks.
• Check the bolt for the correct torque value and adjust the wrench handle accordingly. Loosen the release at the bottom of the wrench and turn it until the marking lines up with the torque specification.
• Tighten the release at the bottom to lock in the setting.
• Put the torque wrench in place and turn it until you hear two clicks, indicating the correct amount of torque has been reached.

Dial Torque Wrench Usage

• Set the torque wrench to the desired torque setting based on the job. Some models feature a double-end drive for tightening and loosening.
• Position the torque wrench on the nut or bolt and begin making adjustments. Many models will have a light or beep to indicate when the correct torque setting has been reached.
• If your model does not have a light or auditory sensor, keep the gauge in view and stop turning the torque wrench when the correct torque has been reached.

Digital Torque Wrench Usage

• Set the torque value on your digital torque wrench using the "SET" button and up or down arrows.
• Program the tolerance parameter to control the "Go" and "No-Go" signal responses, setting upper and lower thresholds.
• Place your torque wrench and begin making adjustments. A buzzer or light will indicate when to stop applying torque.
• Check your reading; a green light typically indicates the correct torque has been achieved, while a red light means the torque was not within the correct tolerance zone.

Torque Wrench Maintenance

• Torque wrenches can withstand wear and tear, but their performance may fade over time. Take your wrench to a repair shop for calibration when this happens.
• Torque wrenches should be calibrated at least once a year or once they reach 5,000 clicks to ensure accurate measurements. Calibration costs around $25-75 USD.
• Always dial your wrench back to 0 before putting it away. Leaving it at a higher torque setting can throw off the calibration over time.
• Clean dirty or rusty nuts and bolts before tightening them, as grime can build up inside the sockets and damage your wrench.

Frequently asked questions